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1.1.范围 本标准第一部分适用于平行轴内外渐开线直齿轮和斜齿轮,法向径节等于或大于20。 它规定了基准齿形、术语、代号、第一系列和第二系列标准径节和评定齿轮精度等级的基本公差。 对每种齿轮规定的精度等级为10级。因此,本标准可以满足从粗糙的机械用齿轮到高速重载田高精度齿轮的要求 1.2.术语、定义和代号 为了达到国际的统一,采用了ISO/R888草案《国际齿轮词汇表》中的术语和定义,同时采用了ISO/R889草案中的代号和符号。
1.1. Scope The first part of this standard applies to involute spur and helical gears with involute splines both inside and outside parallel axes. The normal diameter section is equal to or greater than 20. It defines the basic tooth profile, terms, code, first series and second series of standard diameters and basic tolerances for the evaluation of gear accuracy. The specified accuracy level for each gear is level 10. Therefore, this standard can meet the requirement of high precision gears from rough mechanical gear to high speed and heavy load. 1.2. Terms, Definitions and Codes In order to achieve the international unification, the terms in the ISO / R888 draft “International Gear Glossary” Definition, while using the ISO / R889 draft code and symbols.